Ada Schmidt Hammer 225 А00191 [25/36] Schmidt hammer 225

Schmidt Hammer 225

MEASUREMENT FOUNDATION

25

Rebound values.

As we all know, using rebound hammer inspecting strength of concrete components is actually detected the surface

hardness of concrete and use a special denition of rebound values to describe and characterization of concrete

hardness,

obtained the correlation curve and mathematical model between rebound values and concrete components strength by

testing methods.

L’—Rebound distance at rst after strike hammer and rod are impacted

2.10 Graduated Scale of rebound value.

According to Test Hammer working principle and denition, design a special scale —rebound value graduated scale. This

ruler’s scale line distribution and arrangement is as follows: Rebound value full scale for 100, from 10 to 100 degrees as

45 grid, each grid for the two rebound values, numbers scale line : 10-20-20... ...100, the actual length of 67.5mm, from

the zero line to 100 scale lines, a length of 70mm.

R = X100%